Agonimia gelatinosa (Ach.) M. Brand & Diederich

in Sérusiaux & al., Lejeunia, 162: 6, 1999. Basionym: Verrucaria gelatinosa Ach. - Lichenogr. Univ.: 283, 1810.
Synonyms: Endocarpon gelatinosum (Ach.) Müll. Arg.; Polyblastia caliginosa Norman; Polyblastia gelatinosa (Ach.) Th. Fr.; Verrucaria nigrata Nyl.
Distribution: N - Frl (Hafellner 2014b), Ven (Nascimbene & al. 2021), TAA (Hafellner 2014b, Nascimbene & al. 2022). C - Abr (Tretiach 2015n, Gheza & al. 2021).
Description: Thallus crustose, episubstratic, dark brown or almost black, slightly gelatinous when wet, consisting of rounded (18-35 μm) or lobed (70-120 μm) goniocysts, without sterile globules, the surface cells brown, non-papillate, delimited by a conspicuous dark prothallus. Perithecia black, smooth, matt, subglobose, 0.2-0.5 mm across, 1/4-1/2 immersed in thallus, developing on the substratum. Exciple 40-70 μm thick, pigmented in outer part, colourless and of compressed cells within; involucrellum absent; hymenial gel hemiamyloid: I+ red (I+ blue at low concentrations), K/I+ blue; hamathecium of periphyses and periphysoids, interascal filaments absent. Asci 8-spored, clavate, thin-walled, fissitunicate with a very thin exoascus, surrounded by a hemiamyloid gel (K/I+ blue). Ascospores muriform, with 15-32 cells visible in optical section, hyaline (rarely brownish when old), ellipsoid, 30-55(-60) x 15-20(-25) μm. Pycnidia rare, black, small, ovoid. Conidia bacilliform, 2.3-3 x 0.7-0.8 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a species growing on plant debris and mosses in dry calcareous grasslands, with optimum near treeline; perhaps more widespread in Italy.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 04
Herb. J. Nascimbene

P.L. Nimis CC BY-SA 04
Herb. J. Nascimbene

Elena Pittao CC BY-SA 4.0
TSB 36952

Elena Pittao; Owner: Derpartment of Life Sciences, University of Trieste CC BY-SA 4.0
Herbarium: TSB (36952)

Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain